Save birds from window collisions with these elegant Phases of the Moon window clings. The static cling decals follow the phases of the moon from new moon, through crescent moons, half moon, gibbous moon, to a full moon and then back again to a new moon. There are 11 total moon shapes, and the full moon is about 3.5" diameter. Handmade in Mount Shasta, California Window Gems are made with a colorless translucent prismatic vinyl which captures sunlight and turns it into sparkly rainbows. They are stunning, constantly changing, and perhaps a teeny bit magical. Any bright light source makes the gems glow with rainbows, even moonlight. Instructions: Apply Window Gems to OUTSIDE of windows for maximum bird protection. After washing window well, apply gems smooth side toward the glass.